Selena Gomez appeared to have taken tips from divas including Mariah Carey and Celine Dion as she took to the stage last night for her Florida concert.The 19-year-old singer donned a Vegas showgirl-style sequinned dress for the We Own the Night show, but didn't quite manage to pull it off, and appeared old before her time in the outfit.The plunging gown featured a sequinned corseted top and tasseled train, and is really aimed at women a few years older than Selena.

Diva: Selena Gomez dazzled in a showgirl-style number at her Boca Raton, Florida concert last night

Glamorous: The Disney starlet belted out her hit songs looking years beyond her age

But Selena's fans certainly looked happy enough as the singer strutted her stuff on the stage at the Mizner Park Ampitheater and belted out some of her most famous songs.The crowd at the concert would have been even more thrilled, had they known that Selena's boyfriend Justin Bieber was hiding out backstage.The superstar made a surprise appearance during his girlfriend's debut concert last week, but preferred to keep a low profile tonight as he supported her on tour.

Secret: Justin Bieber ran out the back door of the ampitheatre after watching the concert from backstage

Low key: Justin remained hidden backstage at last night's concert after appearing onstage with Selena last week

Spotted: But fans quickly realised what was going on and started chasing Bieber's car

Justin watched from backstage with his friend, singer Sean Kingston, before darting out the back door before he could be spotted by the exuberant audience.When he surprised Selena onstage last week he gave her a big hug to cheers from the audience, before singing an acoustic version of Justin Timberlake's hit song Cry Me A River and also performed his own hit, Favourite Girl.Following the show, proud Justin later tweeted to his fans: 'Had a #greatnight and surprised the people. felt good to be on stage. nothing is changing that. #REAL. @selenagomez u did great tonight. proud of u.'

Star: Selena, 19, is touring the US with her We Own the Night concerts

Singing star: Last week Selena was seen on stage in a pink and sparkling number before her boyfriend Justin joined her on stage

Earlier this week Selena was spotted enjoying a day off in Miami after performing in the city.She was pictured relaxing on deck chairs by the pool of her hotel with a girlfriend.The singer, who has been tipped for a role in the Sex And The City prequel, enjoyed her ocean view as she indulged in a spot of rest and relaxation ahead of her performance that night.

Backless beach chic: Selena Gomez made the most of her day off earlier this week indulging in a spot of rest and relaxation in Palm Beach

Summer style: The 19-year-old dressed in a pair of tiny light denim shorts and a grey backless T-shirt with a rose print

Selena is being hotly tipped to star as Charlotte in the new SATC film alongside the likes of Blake Lively as Samantha Jones, Emma Roberts as Miranda Hobbes and Elizabeth Olsen as Carrie Bradshaw.The proposed project is set to focus on Bushnell's two novels, The Carrie Diaries and Summer And The City (published this year) which track the four individuals in their teenage years and early twenties before they become a united female front in New York.Do you have a story about a celebrity? Call the Daily Mail showbusiness desk on 0207 938 6364 or 0207 938 6683. For U.S. stories, phone 310 642 2317.

Romance: Justin Bieber tenderly kisses his girlfriend Selena Gomez for her birthday over the weekend in a snap he posted on Instagram